Int 15 Fn 12  - Topview - Send Message - "open" - Open Object              [Q]

   AH = 12h
   BH = 0Ch
   BL = object
       00h handle is DWORD on top of stack
       window:   fill with given character from scroll origin to end
       keyboard: attach to a window
       timer:    open
       pointer:  start taking input for window
       panel:    associate with a panel file
       01h fill task's default window with given char from scrl org to end
       02h open given task's mailbox for input (task's handle on stack)
       03h open current task's mailbox
       04h attach a KEYBOARD to a window (handle on top of stack)
       05h attach task's default KEYBOARD to a window
       06h open a task's OBJECTQ (task's handle on top of stack)
       07h open current task's OBJECTQ
       0Ch (DV 2.26+) fill def window of task owning handle on top of stck
       0Dh (DV 2.26+) fill default window of parent of current task
    STACK: (if window)   DWORD character to fill with
       (if keyboard) DWORD handle of window to attach to
       (if pointer)  DWORD handle of window to attach to
       (if panel)    DWORD length of filename or resident panel
                 DWORD address of filename or resident panel
       (otherwise)   nothing

Notes: if first byte of panel file name is 1Bh, then the "name" IS a panel
   if first two bytes of panel file "name" are C0hC3h, then the "name" IS
     the panel file
   result code of open may be retrieved with STATUS message
   logical cursor is left at scroll origin after filling window
   the task opening a mailbox becomes its owner, and the only task allowed
     to read the mailbox
   messages are only sent to a pointer object when the mouse is positioned
     in the window to which the pointer has been attached
   there is no need to explicitly open a timer object, as ADDTO and WRITE
     messages automatically open the timer

See Also: AH=12h/BH=0Dh,AH=12h/BH=14h"LOCK"